A Buck-Boost Type Charger with a Switched Capacitor Circuit

Jinn-Chang Wu; Hurng-Liahng Jou; Jie-Hao Tsai

A Buck-Boost Type Charger with a Switched Capacitor Circuit

Jinn-Chang Wu

Hurng-Liahng Jou

Jie-Hao Tsai

Vol. 15, No. 1, pp. 31-38, Jan. 2015

10.6113/JPE.2015.15.1.31

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Abstract

In this paper, a buck-boost type battery charger is developed for charging battery set with a lower voltage. This battery chargeris configured by a rectifier circuit, an integrated boost/buck power converter and a switched capacitors circuit. A boost powerconverter and a buck power converter sharing a common power electronic switch are integrated to form the integrated boost/buckpower converter. By controlling the common power electronic switch, the battery charger performs a hybridconstant-current/constant-voltage charging method and gets a high input power factor. Accordingly, both the power circuit andthe control circuit of the developed battery charger are simplified. The switched capacitors circuit is applied to be the output ofthe boost converter and the input of the buck converter. The switched capacitors circuit can change its voltage according to theutility voltage so as to reduce the step-up voltage gain of the boost converter when the utility voltage is small. Hence, the powerefficiency of a buck-boost type battery charger can be improved. Moreover, the step-down voltage gain of the buck powerconverter is reduced to increase the controllable range of the duty ratio for the common power electronic switch. A prototype isdeveloped and tested to verify the performance of the proposed battery charger.

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Cite this article

[IEEE Style]

J. Wu, H. Jou, J. Tsai, "A Buck-Boost Type Charger with a Switched Capacitor Circuit," Journal of Power Electronics, vol. 15, no. 1, pp. 31-38, 2015. DOI: 10.6113/JPE.2015.15.1.31.

[ACM Style]

Jinn-Chang Wu, Hurng-Liahng Jou, and Jie-Hao Tsai. 2015. A Buck-Boost Type Charger with a Switched Capacitor Circuit. Journal of Power Electronics, 15, 1, (2015), 31-38. DOI: 10.6113/JPE.2015.15.1.31.